Better handling when season has no poster

[mstrelan]

Currently if a season has no poster on thetvdb.com the script will just throw an IOError. In this case I think it would be ideal to then find a poster for the series instead. If that doesn't exist we need to skip adding a poster.

An example of a show like this is 90210 Season 5 (my wife watches it).
http://thetvdb.com/?tab=season&seriesid=82716&seasonid=493163&lid=7

Probably the first "poster" for the series would be best.
http://thetvdb.com/?tab=series&id=82716&lid=7

Full output below of the error below.

C:>python "C:\Users\Michael\SickBeard\sickbeard_mp4_automator\postConversion.py
" "D:\TV Shows\90210\Season 5\90210 5x14 Brother From Another Mother.mkv" I:\Dow
nloads\Usenet\Complete\90210.S05E14.720p.HDTV.x264-EVOLVE\90210.S05E14.720p.HDTV
.x264-EVOLVE.mkv 82716 5 14 2013-02-18
Video codec detected: h264
Audiocodec detected: ac3
Channels detected: 6
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Conversion complete
90210 has queued to be refreshed
{}
success
Tagging file :D:\TV Shows\90210\Season 5\90210 5x14 Brother From Another Moth
er.m4v
Traceback (most recent call last):
File "C:\Users\Michael\SickBeard\sickbeard_mp4_automator\postConversion.py", l
ine 30, in
tagmp4.writeTags(path)
File "C:\Users\Michael\SickBeard\sickbeard_mp4_automator\tvdb_mp4.py", line 54
, in writeTags
path = self.getArtwork()
File "C:\Users\Michael\SickBeard\sickbeard_mp4_automator\tvdb_mp4.py", line 15
8, in getArtwork
return urllib.urlretrieve(posters.topPoster().bannerpath, tempfile.gettempdi
r() + "\poster.jpg")[0]
File "C:\Python27\lib\urllib.py", line 93, in urlretrieve
return _urlopener.retrieve(url, filename, reporthook, data)
File "C:\Python27\lib\urllib.py", line 239, in retrieve
fp = self.open(url, data)
File "C:\Python27\lib\urllib.py", line 207, in open
return getattr(self, name)(url)
File "C:\Python27\lib\urllib.py", line 462, in open_file
return self.open_local_file(url)
File "C:\Python27\lib\urllib.py", line 476, in open_local_file
raise IOError(e.errno, e.strerror, e.filename)
IOError: [Errno 2] The system cannot find the path specified: ''

[mdhiggins]

Fixed, if it can't find a poster now it will simply not write that atom

When I get some more time I'll write some code to pull down a generic show poster but at least now it doesn't fail completely.